Binging For The Big Screen

For his role in Dallas Buyer's Club Matthew McConaughey was nearly unrecognizable, dropping 40 pounds
<p><span style="font-size: 9px;">Photo: Getty Images/Everett Collection</a></span>
Cristian Bale went on extreme diet to lose 63 pounds for his role in The Machinist. He dropped down to 122 pounds.
<p><span style="font-size: 9px;">Photo: Everett Collection</span>
Christian Bale gained 43 pounds for his role in American Hustle.
<p><span style="font-size: 9px;">Photo: Everett Collection</span>
Hillary Swank bulked up for her role in Million Dollar Baby, gaining 19 pounds of muscle!
<p><span style="font-size: 9px;">Photo: Getty Images/Everett Collection</a></span>
Matthew Fox dropped 40 pounds to play an assassin in Alex Cross.
<p><span style="font-size: 9px;">Photo: WireImage/Everett Collection</a></span>
For his role as a football player battling cancer in All Things Fall Apart, 50 Cent lost over 50 pounds.
<p><span style="font-size: 9px;">Photo: Getty Images/<a style="font-size: 9px;" href="http://www.youtube.com/watch?v=qxR3xpp2TIY" target="new"> Youtube</a></span>
Anne Hathaway dropped 16 pounds on a detox diet for her role in Les Miserables.
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Natlie Portman lost 20 pounds for her Black Swan role as a ballerina.
<p><span style="font-size: 9px;">Photo: Getty Images/Everett Collection</span>
Mila Kunis also dropped 20 pounds for her ballerina role in Black Swan - she got down to just 98 pounds.
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Matt Damon lost 40 pounds to play an army medic in Courage Under Fire in 1996.
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For his role in The Informant, Matt Damon put on 30 pounds to play a CIA-informant. He told 'EW' that on top of meals on set, he would also eat McDonald's and a bag of Doritos!
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Seth Rogan lost 40 pounds for his role in The Green Hornet.
<p><span style="font-size: 9px;">Photo: FilmMagic/Everett Collection</a></span>
Renee Zellweeger made her weight go up and down for a few movie roles. She gained and then lost 20 pounds for Bridget Jone's Diary and Chicago, and then gained back the weight for Bridget Jones: The Edge of Reason.
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George Clooney gained 30 pounds for his role as a CIA operative in the movie Syriana.
<p><span style="font-size: 9px;">Photo: Getty Images/Everett Collection</span>
For her role in 2003's Monster, Charlize Theron put on 30 pounds!
<p><span style="font-size: 9px;">Photo: Getty Images/<a style="font-size: 9px;" href=" http://www.youtube.com/watch?v=vq70brIQP40" target="new"> Youtube</a></span>
Ryan Reynolds worked out every day for six months to bulk up for his role in Green Lantern. He gained 20 pounds in muscle!
<p><span style="font-size: 9px;">Photo: Getty Images/<a style="font-size: 9px;" href=" http://www.youtube.com/watch?v=myJOVyUTWcc" target="new"> Youtube</a></span>
Vincent D'Onofrio gained a record-breaking 70 pounds for his role in '80s film Full Metal Jacket.
<p><span style="font-size: 9px;">Photo: Everett Collection</span>
Robert De Niro gained 60 pounds for his role in Raging Bull - but for only one scene!
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To get down her body fat percentage, Demi Moore endured military training for her role in G.I. Jane.
<p><span style="font-size: 9px;">Photo: WireImage/Everett Collection</a></span>
After gaining 10 pounds in muscle for her role as Pepper Potts in Iron Man 2, Gwyneth Paltrow then gained 20 pounds for her role in Country Strong.
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Jake Gyllenhaal lost about 20 pounds for his role in Nightcrawler.
<p><span style="font-size: 9px;">Photo: Getty Images/Getty Images</a></span>
Gaining 67 pounds for his role in Chapter 27, Jared Leto could barely walk to the set of the movie by the end of filming. His weight gain had even given him gout!
<p><span style="font-size: 9px;">Photo: WireImage/Everett Collection</a></span>
Jared Leto also lost a significant amount of weight for his role in Dallas Buyer's Club, slimming down to a mere 114 pounds to play an HIV-positive transsexual.
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Colin Farrell went on an extreme diet to lose 44 pounds for his role in Triage.
<p><span style="font-size: 9px;">Photo: WireImage/Everett Collection</a></span>
Russell Crowe packed on 63 pounds for his role in Body of Lies.<p><span style="font-size: 9px;">Photo: Getty Images/Everett Collection</a></span>
Tom Hanks played a lawyer dying of AIDS in 1993's Philadelphia, and lost almost 30 pounds for the part.
<p><span style="font-size: 9px;">Photo: Getty Images/Everett Collection</a></span>
Tom Hanks lost 55 pounds for his prominent role in Castaway.
<p><span style="font-size: 9px;">Photo: Everett Collection</a></span>